From: Andrew Morton <akpm@osdl.org>
To: Dave Jones <davej@redhat.com>
Cc: AChittenden@bluearc.com, linux-kernel@vger.kernel.org,
lwoodman@redhat.com, Jens Axboe <axboe@suse.de>
Subject: Re: Out of Memory: Killed process 16498 (java).
Date: Thu, 19 Jan 2006 14:15:15 -0800 [thread overview]
Message-ID: <20060119141515.5f779b8d.akpm@osdl.org> (raw)
In-Reply-To: <20060119194836.GM21663@redhat.com>
Dave Jones <davej@redhat.com> wrote:
>
> On Thu, Jan 19, 2006 at 03:11:45PM -0000, Andy Chittenden wrote:
> > DMA free:20kB min:24kB low:28kB high:36kB active:0kB inactive:0kB
> > present:12740kB pages_scanned:4 all_unreclaimable? yes
>
> Note we only scanned 4 pages before we gave up.
> Larry Woodman came up with this patch below that clears all_unreclaimable
> when in two places where we've made progress at freeing up some pages
> which has helped oom situations for some of our users.
That won't help - there are exactly zero pages on ZONE_DMA's LRU.
The problem appears to be that all of the DMA zone has been gobbled up by
the BIO layer. It seems quite inappropriate that a modern 64-bit machine
is allocating tons of disk I/O pages from the teeny ZONE_DMA. I'm
suspecting that someone has gone and set a queue's ->bounce_gfp to the wrong
thing.
Jens, would you have time to investigate please?
next prev parent reply other threads:[~2006-01-19 22:13 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-19 15:11 Out of Memory: Killed process 16498 (java) Andy Chittenden
2006-01-19 19:48 ` Dave Jones
2006-01-19 22:15 ` Andrew Morton [this message]
2006-01-20 8:12 ` Jens Axboe
2006-01-20 8:23 ` Andrew Morton
2006-01-20 12:08 ` Jens Axboe
2006-01-20 12:17 ` Andrew Morton
2006-01-20 12:28 ` Jens Axboe
2006-01-20 12:51 ` Andrew Morton
2006-01-20 1:03 ` Andrew Morton
2006-01-20 1:28 ` Dave Jones
2006-01-20 1:49 ` Andrew Morton
2006-01-21 20:00 ` Dan Aloni
-- strict thread matches above, loose matches on Subject: below --
2006-01-27 11:53 Andy Chittenden
2006-01-27 14:21 ` Jens Axboe
2006-01-27 14:39 ` Anton Altaparmakov
2006-01-23 10:03 Andy Chittenden
2006-01-23 10:11 ` Jens Axboe
2006-01-21 21:47 Andy Chittenden
2006-01-23 9:27 ` Jens Axboe
[not found] <89E85E0168AD994693B574C80EDB9C27035561DE@uk-email.terastack.bluearc.com>
2006-01-20 17:39 ` Jens Axboe
[not found] <89E85E0168AD994693B574C80EDB9C27035560E4@uk-email.terastack.bluearc.com>
2006-01-20 12:37 ` Larry Woodman
[not found] <89E85E0168AD994693B574C80EDB9C2703555F8E@uk-email.terastack.bluearc.com>
2006-01-19 9:44 ` Andrew Morton
2006-01-19 9:40 Andy Chittenden
2006-01-19 9:41 ` Con Kolivas
2006-01-19 8:43 Andy Chittenden
2006-01-19 8:56 ` Andrew Morton
2006-01-19 9:36 ` Con Kolivas
2006-01-19 20:54 ` Martin Bligh
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